Air pressure dry pan



Nov. 29, 1932. H. K. KING AIR PRESSURE DRY PAN Filed Aug. 29, 19:51

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Nov. 29, 1932. H. K. KING AIR PRESSURE DRY PAN Filed Aug. 29. 1931 4 Sheets-Sheet 2 A TTOBNEY.

Nov. 29, 1932. H. K. KING AIR PRESSURE DRY PAN Filed Aug. 29. 1931 4 Sheets-Sheet 5 mmran; flbwardE-Zfi 1% I TTO/MEY.

Nov. 29, 1932. H. K. KING 1,889,555

AIR PRESSURE DRY PAN Filed Aug. 29, 1931 4 Sheets-Sheet 4 on line 5, 5.= ot Fig. 4. a

Patented Nov. 29, 1932 U NIirEDLi rATss: PATENT cr mes? J HOWARD 1:. KING, or fnrLAnELrH'IA, PENNSYLVANIA,- 'Assmnon r0 CH BERS nno'rnnas COMPANY, A conroRA'iIoN or PENNSYLVANIA Am new mix PAN Aipplica tion filed August 29, 1931-; serial No. 560,136. I

The invention relates to improvements. in

air pressure dry pans. v

' The object is to provide improved means for increasing or decreasing the.- pressur e" of V Y 5 themuller rollers.- V

Dry pans heretofore in common use were equipped with muller rollers which depended for their crushing pressure solely or chiefly,

upon the weight of the rollers, and after mwards various :means were employedfor augmenting or increasing said crushing pressure beyond that due to their weight. In this way the size and weight ofthe rollers could'be reduced while maintaining the de- 15 sired maximum crushing pressure.

It has beenfound however that inoperating uponcertain materials, the mullers now in common use exert a crushing pressure, due to'their weight alone, which grind the material more than is'desirable, that is a the material is liable to be reduced to'a fine powder whereas it should only-be reduced to a granular condition.

It has: been found thatby resi-lientlysupcrushing pressure which is 'du'e to apart only of their gravity" Weight the same may 'be exactly adaptedto the-particular material operated upon and that the desiredcharac- 30 ter'of the product ma yfbe secured. This lightening of the rollers may be secured through a desired range of pressures.- By combining such means, with adjustable means for augmenting the normal crushing a wide range of crushingfpressures may be secured, to suit materials and products of substantially difierent 'characterlstlc's.

horizontal section'on line-4, of Fig. 5 is a section, an: enlarged scale,

pressure of the rollers due to their weight,

Referring tothe drawings,'- which illus due to the weightof'theroller only. trate merely by way of example, suitable In] accordance therefore with the present invention, a pipe 22 is eonnected'to a source of air pressurenot shown; it being under- Fig. 2 is avertical section on line-2, 2 of F ig; 6 is a section'ton a still larger scale j of the vented checkvalve.

Similar numerals refer to similar parts throughout the several views. V v 1 In the present example two muller rollers.

8 are used,each roller mounted on an axle 12 which is supported in bearings formed in the two arms of yoke 9 j ournaled on the shaft 10. The, outerends 11 of the arms ofthe yoke 9 extend beyond theiaxle 12 and are pivotally connected as at 14, by adjustable turnbuckles 15, or the like, directly to afpiston rod 16. Each piston rod 16 is connected to piston 18 operating in acylinder 19. Each'cylinder 19 is hung by a pair of lugs 20 upon a supporting pin 21 so as to have a slight rocking movement thereon to accommodate the slight arcuate-movement ofthe lower end of its porting frame 351 v As. each arm of each y0ke',=in thepresent example, is connected to a piston rod, it will be understood that the crushing pressure of each roller: is controlled-by two cylinders.

' It willhowever beiobviou's that, in some cases a single arm ofeach yoke may be connected to a piston rod, in which casea roller may be controlled by a'single cylinder.

The general construction, above described," 1 is shown in my copending application filed Nov.1 4, 1930, Serial No. 495,682.

1 The present invention comprises improved meansfor communicating varying pressures to either side of each piston, whereby the crushing pressure exerted by the rollers may be controlled was to have a yalue either greater or less than that exerted by gravity stood that this" air" pressure, or the pressure piping 25 delivering to the upper endso'f the cylinders, and to'piping 26 deliveringto the lower ends of the cylinders. A hand valve 27 is provided for establishing communication between the upper ends of cylinders and the outside atmosphere, while a hand valve 28 is provided for establishing communication be tween the lower ends of cylinders and the outside atmosphere.

The piping 25 is connected to the upper ends of the cylinders through check valves 29. This system of piping is also provided with pop safety valves 30.

The piping 26 is connected to the lower ends of the cylinders through vented check valves 31 provided with a permanently opened vent 32 shown in detail in Fig. 6. The piping system 26 may also include sections 33 of flexible rubber steam hose or other suitable means for permitting slight movement of the cylinders. The piping 22 connected with the compressor or other source of compressed elastic medium, is provided with the usual pressure gage 34 and also with an ad- .justable reducing valve 35.

In operation:

When it is desired to augment the crushing pressure exerted by the rollers, valves 23 and 28 are opened, while valves 24: and 27 are closed. This permits compressed elastic fluid medium to enter the upper parts of the cylinders, to exert downward pressure on pistons 18, while air is permitted to enter and escape through vented check valves 31 and valve 28.

WVhen the roller encounters an obstruction, such as a hard lump, it is usually given an upward movement, causing an upward movement of the piston connected thereto; in which case the valve. 31 opens to permit the free passage of air into the cylinder beneath the piston. When the roller passes or overcomes the obstruction, it falls thereby causing a downward movement of the piston connected thereto; in such case the air beneath the piston can only escape through the vent 32 in valve 31. As this is a restricted vent, the air may be compressed to a certain extent before escaping, thus cushioning the said downward movement of piston and roller.

It will also be understood that when the roller is caused to rise as above described, its crushing pressure is temporarily increased by trapping and compressing the compressed elastic fluid medium above the piston. This is due to the action of the check valve 29; any undue pressure being relieved by the pop safety valve 30. When it is desired to lighten the rollers, that is, to secure a crushing pressure less than that normally exerted by the weight of the rollers, valves 24 and 27, are opened while valves 23 and 28 are closed. This permits compressed elastic medium to enter the lower ends of the cylinders to exert pressure upon the undersides of the pistons and thus reduce the crushing pressure exerted by the rollers.

When the crushing pressure of the rollers is thus reduced, it is especially important, upon a roller encountering an obstruction, such as a hard lump, that its crushing pressure be temporarily increased. This increase of pressure is secured by trapping the air in the cylinder above the piston by means of check valve 29 so that as the piston rises the crushing pressure of the roller is increased.

In this way, while the desired character of the product is secured, the efficiency of the device to deal with hard lumps is not impaired.

By regulating the pressure of the compressed elastic fiuid medium introduced into the cylinders either above or below the piston, a wide range of adjustment is secured of the crushing pressure of the rollers, either above or. belowi'that exerted by gravity due to the weight alone of said rollers. This regulation of pressure of the compressed elastic fluid medium admitted to the cylinders is secured by the adjustable reducing Valve 35, or other suitable means.

What I claim is 1. In a device of the character described, means, having a substantial range of adjustment, for determining the crushing power of the roller from below that exerted due to gravity to above that due to gravity, comprising a movable roller bearing, a cylinder having a piston operating therein, means establishing operative relationship between the piston and the bearing, means for connecting the cylinder on each side of the piston with a source of compressed elastic medium, and means for controlling the delivery of the medium to either end of the cylinder as required.

2. In a device of the character described, means, having a substantial range of adjustment, for determining the crushing power of the roller from below that exerted due to gravity to above that due to gravity, comprising a movable roller bearing, a cylinder having a piston operating therein, means establishing operative relationship between the piston and the bearing, means for connecting the cylinder on each side of the piston with a source of compressed elastic medium, means for adjusting the amount of said pressure, and means for controlling the delivery of the medium to either end of the cylinder as required.

3. In a device of the character described, 7 means, having a substantial range of adjustment, for determining the crushing power of the roller from below that exerted due to gravity to above that due to gravity, comprising a movable roller bearing, a cylinder provided with suitable check valves and hav ing a piston operating therein, means establishing operative relationship between the piston and the bearing, means for connecting the cylinder on each side of the piston with a source of compressed elastic medium, and

means for controlling the delivery of the medium to either end of the cylinder as required. V v

4. In a device of the character described ment, for determining the crushing power of the roller from' below that exerted due to gravity to above that due to gravity, comprising a movable roller bearing, a cylinder 7 having a piston operating therein, means es- 7 tablishing operative relationship between the piston and the bearing, means for connecting the cylinder on each side of the piston with a source of compressed elastic medium, and means for controlling the delivery of the medium to either end of the cylinder as required, said cylinder also provided with a suitably positioned restricted vent forfcooperation with the piston in. first retarding and then arresting the downward movement of the roller.

HOWARD K. KING.

means, having a substantial range of adjust 

